Abstract: In a system supplying power from an AC power supply to a three-phase motor via a converter and an inverter, a leakage current reducing apparatus is connected to a connection line between the AC power supply and the converter. A common mode transformer detects, as common mode voltage, common mode current flowing from the AC power supply to the connection line. The common mode voltage is inputted to a voltage amplifier via a filter apparatus. Output voltage obtained by voltage amplification passes through a capacitor and then is applied as an AC component to a neutral point of capacitors connected in a Y-connection fashion, so as to have the same phase as that of the common mode voltage. Thus, current having the same phase as that of the common mode current is supplied via the capacitors to the converter through the connection line, thereby reducing the common mode current.

Abstract: An apparatus includes: a drying unit to dry a printing medium on which an image was printed using an inkjet head; a humidification unit to humidify the printing medium that was dried by the drying unit so that the moisture content of the printing medium becomes the equilibrium state in the ambient environment; a colorimetric unit to perform colorimetry on the printing medium that was humidified by the humidification unit; and a calibration unit to calibrate printing properties on the basis of the result of colorimetry by the colorimetric unit.

Abstract: An inkjet recording apparatus includes a recording head configured to discharge ink, a first ink tank configured to store ink to be supplied to the recording head, a circulation path configured to circulate ink between the first ink tank and the recording head, a measurement unit configured to measure an ink temperature in the circulation path, a second ink tank configured to replenish ink to the circulation path, and a control unit configured to control replenishment of ink from the second ink tank to the circulation path based on the ink temperature measured by the measurement unit.

Abstract: An apparatus includes a printing unit configured to eject ink from a print head onto a sheet conveyed in a direction to perform printing on the sheet; a conveying unit configured to be provided on a downstream side of the print head in the direction, and configured to include a rotating member in contact with the sheet; and a reading unit configured to read a surface of the sheet on a downstream side of the rotating member in the direction, in which information on ink adhesion to the rotating member is obtained based on a result read by the reading unit.

Abstract: First windings of a first common mode transformer and second windings of a second common mode transformer are connected in series via connection lines. The windings are connected to an AC power supply via connection lines. The first windings are connected to a three-phase motor via connection lines, a converter, and an inverter. High-frequency leakage currents flowing in the connection lines are detected as a common mode voltage by a winding for common mode voltage detection. An output voltage is inputted via a filter to a voltage amplifier unit that amplifies the output voltage, and the amplified voltage is applied to a winding via a capacitor in substantially a same direction as a direction of the common mode voltage. As a result, leakage currents are reduced by induced voltages on the windings.

Abstract: The object is to effectively reduce the resonant current flowing inside a converter unit and an inverter unit in a power conversion apparatus for an electric vehicle. The power conversion apparatus includes a converter unit that converts an alternating-current power into a direct-current power, an inverter unit that converts the direct-current power into an intended alternating-current power and supplies the intended alternating-current power to an electric motor that drives an electric vehicle, a housing that accommodates the converter unit and the inverter unit and a part of which is connected to ground, and a magnetic core that is disposed inside the housing and that suppresses the resonant current flowing between the converter unit and the inverter unit.

Abstract: A leg includes: two semiconductor device groups connected in series and a division current is generated in a current which flows in the semiconductor device group between elements in the semiconductor device groups, a current sensor which detects a current which flows in the semiconductor device group, a voltage command generation unit which calculates a voltage command value to be outputted, a voltage drop calculating unit which calculates a voltage drop of the semiconductor device group by using a current value which is detected by the current sensor and voltage drop characteristics including a division characteristic of the semiconductor device group, and a switching control unit which corrects a voltage command value which is generated by the voltage command generation unit by using the voltage drop which is calculated so as to control ON/OFF of the switching element.

Abstract: A recording apparatus includes a recording head, a roller configured to convey a recording medium, an acquisition unit configured to acquire information about a conveyance amount for conveying the recording medium per a predetermined rotation amount of the roller, a recording timing generation unit configured to generate a plurality of timing signals for performing recording for one raster line according to a rotation of the roller during one rotation thereof, and a drive signal generation unit configured to generate a drive reference signal for performing the recording for the one raster line on the recording medium at a predetermined interval based on the conveyance amount information and the timing signal.

Abstract: An inkjet printing apparatus, an inkjet printing system and an inkjet printing method are provided in order to correct a print density at a joint (overlapped portion) of nozzle arrays of a print head. The print density at the joint (overlapped portion) of the nozzle arrays is corrected based on a positional deviation between two adjacent nozzle arrays of the print head.

Abstract: A process of detecting a defective recording element and a process of correcting the defective recording element are performed with appropriate processing loads. When the detection process and the correction processes are performed with small loads, for example, at a time of recording, a resolution used for reading an inspection pattern is set lower than that set in a case where the processes can be performed with small loads, for example, at down time before recording. The reading resolution to be set may be determined by an apparatus in accordance with a processing load or may be arbitrarily determined by a user.

Abstract: A power converting apparatus includes a main inverter having a high-voltage DC power supply that operates at a low frequency employing SiC MOSFETs having a high withstand voltage exceeding 600 V and a sub-inverter having a low-voltage capacitor that operates through high-frequency PWM employing Si MOSFETs having a low withstand voltage. With AC sides of the main inverter and the sub-inverter connected in series, the power converting apparatus outputs AC power having a prescribed voltage waveform by adding voltages individually generated by the main inverter and the sub-inverter. Specifically, the SiC MOSFETs are used only in the main inverter of which devices are required to have a high withstand voltage and the Si MOSFETs are used in the sub-inverter of which devices may have a relatively low withstand voltage, whereby conduction loss is reduced with an inexpensive circuit configuration.

Abstract: According to the present invention, each printing head includes chips wherein a plurality of nozzles are prepared. The density of dots formed by ejecting ink from the nozzles is detected for each chip, and when a density difference between the chips is smaller than a predetermined value, print data are corrected, and the number of dots is adjusted so as to reduce the density difference. When the density difference is equal to or greater than the predetermined value, first, a drive pulse for the nozzles is modulated and the volume of ink to be ejected for one dot is adjusted so as to reduce the density difference. Thereafter, the print data is corrected, and the number of dots to be formed is controlled so as to reduce the density difference.

Abstract: A printing apparatus conducts inspection associated with printing by changing a relative positional relationship between a line print head and a sheet feeding position for a sheet in a direction perpendicular to a direction in which the sheet is fed, forming an image on the sheet using the line print head a plurality of times, and reading the formed images using a reading unit.

Abstract: A printing apparatus includes a full-line printhead in which a plurality of chips, on each of which a plurality of nozzle arrays are juxtaposed, are arranged in the nozzle arrayed direction, and which prints by the entire width of a printing medium using a plurality of nozzles arranged on the plurality of chips. The printing apparatus discharges ink from a predetermined number of successive nozzles on each nozzle array of each chip toward a printing medium during conveyance, thereby forming a plurality of first patterns corresponding to at least one nozzle array of each chip on the printing medium in the nozzle arrayed direction, reads the plurality of first patterns from the printing medium during conveyance using a sensor, calculates the shift amount of an ink attached position based on the plurality of read first patterns and corrects the attached position of ink based on the shift amount.

Abstract: To provide an inkjet printing apparatus that suppresses occurrence of image deterioration, such as a texture, a moire, and a streak in a printing result. In order for this to be achieved, a level is set up to a overlapping portion of a chip of a print head depending on dot impact accuracy, and a print data distribution rate of each chip in the overlapping portion is determined according to the level.

Abstract: When an image is recorded using a multichip recording head including a plurality of chips each having a plurality of nozzle arrays, a change in image density can occur due to a registration error between chips in an overlapping part where two chips are connected. To suppress the change in image density, input image data is distributed to two chips such that there are dots overlapping each other between the two chips in the overlapping part.

Abstract: When distributing image data of a plurality of planes to a first chip and a second chip that constitute the same overlapped portion of a connected head, a distribution method is changed for at least a part of the plurality of planes.

Abstract: Three-phase windings 11-13 and 21-23 of a first common-mode transformer 1 and a second common-mode transformer 2 are connected in series through connecting lines 8r-8t, respectively. The windings 11-13 are connected to an unillustrated AC power supply by connecting lines 91r-91t. The windings 21-23 are connected to a three-phase motor by connecting lines 93r-93t and through a converter and an inverter which are unillustrated. A winding 14 for common-mode voltage detection detects high-frequency leakage currents flowing through the connecting lines 91r-91t as a common-mode voltage V1, and an output voltage V2 obtained by voltage amplification by a voltage amplifier 3 is applied to a winding 24 for common-mode voltage application in such a manner that the output voltage V2 works in generally the same direction as the common-mode voltage V1, thereby canceling out the high-frequency leakage currents through the windings 21-23.

Abstract: The present invention provides a recording apparatus including recording heads each including a plurality of nozzle arrays that are arranged so as to overlap, wherein overlapping portions of the recording heads for two different colors are separated from each other with a distance therebetween in an array direction of nozzles.

Abstract: The present invention provides a recording apparatus including recording heads each including a plurality of nozzle arrays that are arranged so as to overlap, wherein the width with which the overlapping portions of the recording heads for colors that are simultaneously used with a relatively high frequency overlap in an intersecting direction that intersects an array direction of nozzles is smaller than the width with which the overlapping portions of the recording heads for colors that are simultaneously used with a relatively low frequency overlap in the intersecting direction.